Frederick mutimer



, F. MUTIMER. 7 METHOD OF MANUFACTURING SET SUREW BLANKS.

PatentedApr. 30.-.188,9.

UNITED STATES PATENT OFFICEa FREDERICK MUTIMER, OF ROCKFORD, ILLINOIS,ASSIGNOR OF ONE-HALF TO THE ROCKFORD BOLT WORKS, OF SAME PLACE.

METHOD OF MANUFACTURING SET-SCREW BLANKS.

SPECIFICATION forming part of Letters Patent No. 402,271, dated April30, 1889.

Application filed December 8, 1888. Serial No. 293,031. (No model.)

To all whom it may concern:

Be itknown that I, FREDERICK MUTIMER, a citizen of the United States,residing at Rockford, in the county of Winnebago and State of Illinois,have invented a new and bar enough material to form two set-screw blanksat the same operation that their rectangular portions are formed.

The third object is to form the'rectangular portion of two set-screwblanks and after ward transversely cutting the rectangular portion, thusforming two complete set-screw blanks.

The dies for carrying out my improved process are represented in theaccompanying drawings, in .which Figure 1 is an isometricalrepresentation. Fig. 2 is a horizontal central section showing twosot-screw blanks in position in the dies, also the gage for determiningthe length of the blanks. Fig. 3 shows a section of the face of thedies. Fig. 4 is an isometrical representation of two setsorew blanks asthey come from the dies. Fig. 5 is an isometrical representati'on of thecomplete set-screw blank.

' Fig. 6 is an isometrical representation of a setscrew blank with afinished head.

The dies in this instance are rectangular in form, and consist of twolike halves, 1. and 2. The meeting faces of these dies are formed insemicircular grooves 3 of the diameter of the bar material from whichthe blanks are made. A portion of these grooves are in rectangular form,as shown at 4. The length of this rectangular portion is sufficient toform the rectangular portion of 'two set-screw blanks. A guide-plate, 5,is formed with perforations 6, through which the bar material is fed tothe dies. A gage, 7, (shown in Fig. 2,) is placed at the proper distancefrom the face of the dies to limit the length of bar material fed to thedies. This gage may be adjusted to or from the face of the dies, asoccasion may require. The guide-plate 5 and one half of the die are heldstationary in a suitable manner, while the remaining half of the die ismade removable to and from the stationary half:

The bar, 8, from which the blanks are made is passed through the openingin the guideplate until it reaches the gage. The movable part of the dieis then caused to approach its stationary half. In this movement theprojecting portion of the bar will be cut off, the edges 9 forming theknife. The bar will then be compressed between the faces of the dies andthe rectangular formation given to it, as shown at 10, Figs. 2 and 4.The movable portion of the die is then returned, and the cut-01f portionwill be released from the dies and the operation repeated. The cutoffportion of the bar, having its central portion reduced in rectangularform, is out about the center of the rectangular portion, as shown bydotted lines, 4. Each half will constitute a completeset-screwblank,which is properly threaded in the usual manner. Theprocess of cut ting the bar will not leave the cut surfaces of therectangular portion in the best shape, but will answer for a cheapblank. When'a better-finished blank is required the end of therectangular portion is finished by taking off the corners, as shown inFig. 6.

It is evident that by setting the gage nearer to the face of the dies,as shown in dotted lines, Fig. 2, I am able at a single operation toproduce two set -screw blanks difiering in length. The same result canbe obtained by varying the position of the rectangular portion 4 cf thegroove 6 with respect to the length of the groove.

I do not limit myself to a square-headed set screw blank, as a hexagonalhead can be produced in the same manner.

In carrying out my improved process it is not necessary to heat the barmaterial from which the blanks are made, as I have formed blanks fromthe bar in the cold state.

The dies illustrated in the accompanying drawings is one form of meansfor carrying out my process; but evidently other forms may be devisedfor accomplishing the same result.

I claim as my invention 1. The herein-described process of manufacturingset-screw blanks, consisting in rc= dueing in a single operation asection of the bar material to a polygonal form of sufficient length toform the polygonal portion of two set-screw blanks, substantially as setforth 2. The herein-described process of manufacturing set-screw blanks,consisting in feeding material enough to form two blanks, cutting itfrom the main bar, and reducing in a single operation a section of thecut portion to a polygonal form of sufficient length to form thepolygonal portion of two set-screw blanks, substantially as set forth.

3. The herein-described process of manufacturing set-screw blanks,consisting in feeding material enough to form two blanks, cutting itfrom the main bar, reducing a section of the cut portion to a polygonalform. of suf- FREDERICK MUTIMER.

Witnesses:

CHARLES R. WIsE, A. O. BEHEL.

